616661761 has 8 divisors (see below), whose sum is σ = 632496384. Its totient is φ = 600940320.

The previous prime is 616661743. The next prime is 616661779. The reversal of 616661761 is 167166616.

It is an interprime number because it is at equal distance from previous prime (616661743) and next prime (616661779).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 616661761 - 2⁵ = 616661729 is a prime.

It is a super-2 number, since 2×616661761² = 760543454959242242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616661561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17205 + ... + 39106.

It is an arithmetic number, because the mean of its divisors is an integer number (79062048).

Almost surely, 2^616661761 is an apocalyptic number.

It is an amenable number.

616661761 is a deficient number, since it is larger than the sum of its proper divisors (15834623).

616661761 is a wasteful number, since it uses less digits than its factorization.

616661761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56591.

The product of its digits is 54432, while the sum is 40.

The square root of 616661761 is about 24832.6752686858. The cubic root of 616661761 is about 851.1687548486.

The spelling of 616661761 in words is "six hundred sixteen million, six hundred sixty-one thousand, seven hundred sixty-one".